MIMO技术毕业论文.doc

MIMO技术毕业论文 摘 要 MIMO技术由于能够在不增加传输信道带宽的条件下成倍的提高无线信道的容量，因而被认为是现代通信技术中的重大突破之一，越来越成为无线通信领域的研究热点。MIMO技术是未来无线通信系统中实现高数据速率传输、改善传输质量、提高系统容量的重要途径。MIMO信道模型无论是在MIMO技术的理论研究阶段还是在MIMO系统的应用阶段都是必需的。因此，MIMO信道的建模是MIMO理论研究中的重要内容。本文综合考虑了多种因素提出了合理的MIMO信道模型。 本文首先总结了无线信道的特点，包括它的传播方式、衰落特性，并给出了两种常见的无线信道的数学模型和MIMO信道中的一些参数的介绍。在此基础上，根据发射端和接收端天线的阵列结构、发射信号的离开角与角度扩展、接收信号的到达角与角度扩展、角度功率谱、多普勒功率谱等参数，提出了一个合理的MIMO无线信道模型。还详细描述了信道相关性的问题。最后提出了对信道模型进行仿真的方法、流程图，并对仿真结果进行了分析。 关键词：无线信道；MIMO；信道建模；相关性；信道仿真ABSTRACT The Multiple-Input Multiple-Output(MIMO) technology is considered as one of the most promising breakthrough technology in modern mobile communication sestem,It is an impotent approach to improve system performance,enhance the capacity and spectrum efficiency.MIMO channel model is necessary both at the phase of research MIMO technology and the commercial application of the MIMO wireless communication sestem.therefore,the modeling of MIMO channel play a very important role in relevant research. in this dissertation,we integrated a wideband MIMO channel model based on many factor. In this dissertation,at first we sum-up the characteristic of the wireless channel,Including the spread manner and introduce two familiar mathematical model of wireless channel and some parameter of MIMO channel.Then,based on the existing methods of MIMO wireless channel modeling and a variety of present MIMO wireless channel models,we integrated a wideband MIMO channel model.It’s of stochastic type and uses the angle of arrival,angle of departure,azimuth spread,the topology of both transmitter and receiver,the Doppler spectrum,the power delay profile,etc. as its parameters.At last we find a method of MIMO simulation,give the flowchart,and analyse the simulation result. Key words: wireless channel; MIMO; channel modeling; correlation; channel simulation目 录 1 绪论 1 1.1课题的研究背景 1 1.1.1MIMO技术简介 1 1.1.2信道建模的必要性 2 1.2选题意义和研究内容 3 1.3本文的结构 4 2 MIMO无线信道的特点 5 2.1信号传播方式 5 2.2信道衰落 5 2.2.1大尺度衰落特性 6 2.2.2小尺度衰落特性 6 2.3信道扩展 8 2.3.1多径（时延）扩展 8